黄河兰州段水质周年理化参数监测分析

通过对黄河兰州段进行周年理化检测分析，掌握其变化规律，以期为水质监控提供理论依据．研究表明。黄河兰州段水环境理化参数随着不同采样点与季节的变化而不同，水体温度随季节间变化剧烈，在1．8。18℃之间。夏季温度最高，冬季温度最低；水体呈弱碱性，pH值在8．3～8．6之间；关键水质监测参数分析发现水质类别为II～111类，其中II类水质占83％，Ⅲ类水质占17％，包兰桥断面的水质相对较差．     

弹托风洞测力试验及其分离规律计算

该文研究了脱壳穿甲弹弹托分离干扰的分布规律，利用自行设计的一套天平和一套专门用于支撑弹托分离的气动干扰设备，进行了脱壳穿甲弹弹托风洞测力试验，得出了相关的气动力数据。根据此数据及脱壳穿甲弹弹托的特点，建立了微分方程，进行了脱壳穿甲弹弹托分离轨迹的计算，计算结果表明其分离轨迹符合实际情况。     

大范围无线电干涉定位系统

针对无线电干涉定位系统（RIPS）受模糊解问题的制约,难以适用于大范围稀疏布设的无线传感器网络的缺点,提出了一种两频率间隔配置方法（two frequency intervals method,TFIM）.通过理论和仿真分析,得到RIPS定位精度与测量频率数及测量系统占据的总带宽的平方成正比的结论.仿真与实验结果表明：在相同的测量频率数和带宽条件下,TFIM可以在保持定位精度的同时显著扩大节点的布设距离,克服了大距离布设时的系统定位精度不高的问题,拓展了RIPS的应用范围.     

隐藏着可以凑微分的不定积分计算问题

凑微分在不定积分计算中占有很重要的地位，第一换元法和分部积分法都需要先凑微分，但有的被积函数是否可以凑微分不是很明显．就一些常见隐藏在被积函数中能凑微分或是通过适当变换能凑成微分的积分进行了总结，旨在使读者能产生一些启示或积累一点经验．     

实时织物悬垂性能物理模型及应用

快速计算机模拟和仿真技术是纺织物、服装的计算机辅助设计和制造的关键技术组成．逼真的纺织物、布料、服装的三维计算机可视化设计在其他许多领域也非常重要．例如在3DCG电影制作中逼真的计算机服装动态特效、3D电脑游戏、网上购物等．本文着重于计算方法，综述和分析了服装物理模型及其应用的最新进展，探讨了当前主要存在的问题，技术挑战，和可能的解决方案．提出了一种基于变形能的服装悬垂模型及算法，并展示了仿真结果．本文所提出的模型适用于纺织物、服装的快速计算机三维动态模拟．另外，也提出和探讨了识别纺织物材料的复杂动态变形材料性能参数的可能性方案．     

简支桥下部加固设计与施工

芳纶纤维布作为一种新型的结构加固材料，具有轻质高强、高弹性模量、耐腐蚀、抗冲击、抗剪、抗疲劳性能及良好的延性等特点。文章介绍了用纤维布加固某桥的机理，加固设计及施工工艺。     

On fractional control method for four-wheel-steering vehicle

Four-wheel-steering (4WS) system can enhance vehicle cornering ability by steering the rear wheels in accordance with the front wheels steering and vehicle status.With such steering control system,it becomes possible to improve the lateral stability and handling performance.In this paper,a new control method for 4WS vehicle is proposed,its rear wheels steering angle is in accordance with the angle of front wheels steering and vehicle yaw rate,and the effects of front wheels steering angle velocity are consi...     

Engineering Entanglement,Conceptualizing Quantum Information

Proposed by Einstein, Podolsky, and Rosen (EPR) in 1935, the entangled state has played a central part in exploring the foundation of quantum mechanics. At the end of the twentieth century, however, some physicists and mathematicians set aside the epistemological debates associated with EPR and turned it from a philosophical puzzle into practical resources for information processing. This paper examines the origin of what is known as quantum information. Scientists had considered making quantum computers and employing entanglement in communications for a long time. But the real breakthrough only occurred in the 1980s when they shifted focus from general-purpose systems such as Turing machines to algorithms and protocols that solved particular problems, including quantum factorization, quantum search, superdense code, and teleportation. Key to their development was two groups of mathematical manipulations and deformations of entanglement—quantum parallelism and ‘feedback EPR’—that served as conceptual templates. The early success of quantum parallelism and feedback EPR was owed to the idealized formalism of entanglement researchers had prepared for philosophical discussions. Yet, such idealization is difficult to hold when the physical implementation of quantum information processors is at stake. A major challenge for today's quantum information scientists and engineers is thus to move from Einstein et al.'s well-defined scenarios into realistic models.     

恶性肿瘤患者血小板参数的变化及临床意义

目的探讨恶性肿瘤患者血小板参数的变化及临床意义。方法以同期80例健康体检者为对照,回顾性分析80例恶性肿瘤患者血小板参数的变化与肿瘤转移的关系。结果恶性肿瘤患者血小板计数（PLT）、平均血小板体积（MPV）、血小板压积（PCT）及血小板分布宽度（PDW）高于正常对照者（P〈0.01）,伴转移者PLT和PCT高于无转移者（P〈0.01）,而PDW和MPV无显著性差异（P〉0.05）。结论恶性肿瘤患者血小板参数明显增高,提示血小板与了肿瘤的生长和转移有密切关系,血小板参数可作为恶性肿瘤疗效及预后判断的参考指标。     

AR模型参数的Bootstrap方差估计

针对故障诊断中AR模型参数判别门限值的确定需要大量样本和重复多次试验的问题，采用小样本统计的Bootstrap方法对车削振颤AR模型参数的方差进行了估计，结果表明，该方法具有较好的估计结果和工程应用价值。